AK 527

Substrate type
Cement, cement-lime and lime plasters. Walls: made of bricks, ceramic, silicate and cellular concrete blocks and others, concrete surfaces, EPS layer in thermal insulation systems.

Substrate preparation
For bonding thermal insulation boards
Substrate should be clean, dry, stable and sound. New plaster work and concrete should be set and seasoned. Remove loose, cracked and brittle plasters and widen joints. Patch small spots with ALPOL AZ 130 quick setting or ALPOL AZ 135 levelling mortar, apply ALPOL AT 310 plaster on larger surfaces. Remove contamination and peeling paint from sound plasterwork. Dedust the surfaces. Treat the loose substrate with ALPOL AG 700 and ALPOL AG 703 deep penetrating primer to reduce absorption, if necessary.
For embedding reinforcing mesh
The thermal insulation board surface should be clean, dry, stable and sound. Any gaps between boards should be filled with insulation material or polyurethane foam strips cut to size. In case of EPS irregularities or top layer deterioration by UV radiation from sunlight (yellow tarnish), use a metallic rasp or float with sandpaper to sand the surface. After sanding carefully remove the dust from boards using compressed air.

Instructions for use
Stir the bag contents manually or mechanically with specified amount of cold and fresh water to reach a homogeneous and required consistency. Allow 5 minutes and stir the prepared mix again. Use the adhesive within 1 hours from mixing with water. If the adhesive thickens in that period of time, stir it thoroughly without adding water. Adding too much water impairs all adhesive characteristics: adhesion, peel strength, setting time.
Bonding thermal insulation boards:
Apply spots with a trowel onto the EPS board and around its edges, or spread a thin layer with a notched trowel. Press the boards slightly against the wall. Board position can be adjusted within 10 minutes after bonding. Bond the boards within max. 20 minutes from spreading adhesive on the substrate. Fixing with the use of mechanical fasteners can be performed after at least 1 day, whereas the mesh can be embedded after 3 days after bonding the boards.
Embedding reinforcing mesh:
Apply and spread the adhesive with a trowel and a steel float onto bonded boards and then level it with a notched trowel. Then apply the mesh pressing it with the plain side of the float into the adhesive so that the mesh is no longer visible. Apply another coat of adhesive if necessary. The layer of reinforcement (adhesive embedded with mesh) should be approx. 3 mm. Once the adhesive dries, any local possible surface irregularities can be patched again or sanded. After the adhesive is fully dry (minimum 2 days), appropriate plaster primer can be applied. Decorative plaster can be applied no sooner than 3 days after embedding the mesh.

Tools
Mixer or low-speed electric drill, basket mixer, notched trowel, plain float, trowel, container for the adhesive.

Working conditions
Work in ambient temperatures between +5°C and +25°C. Do not add any other agents to the adhesive. Protect freshly applied adhesive from sunlight, excessive drying and moisture. The experience shows that exposing graphite boards to excessive sunlight or overheating results in significant deformations and that depending on type sanding of graphite-enhanced EPS boards may damage surface structure and reduce the adhesion of adhesive. It can lead to falling off freshly bonded boards from the substrate or reduction in quality of reinforced layer. Therefore if using graphite-enhanced polystyrene it is absolutely crucial to follow its supplier guidelines. In doubt perform tests before the work. Adhesive supplier accepts no liability for any damages resulting from insulation material faults or not following its application guidelines.

Storage
Store in original, unopened packages in dry place – shelf life 12 months from production date. Protect from moisture during transport and storage.

Notes
The specifications and instructions for use are given for the temperature of (20±2)°C and relative air humidity of (60±5)%. The workability may alter in different conditions. Becomes alkaline after mixing with water. Irritating to eyes and respiratory system. Appropriate eye, respiratory system and skin protection measures should be used. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Keep away from children. Use water to clean fresh dirt or the ALPOL AI 770 clinker cleaner for cleaning hardened dirt. The manufacturer accepts no responsibility for damage caused by unskilful or inappropriate use of the product.

General recommendations
Always follow good building practices, observing health & safety standards and regulations. Refer to the application manuals for ALPOL insulation systems, ITB instructions or indications provided in this data sheet for details on bonding insulation boards and insulating walls.